CN106480471B - EMD Continuous leaching process chemical combination slot pH value control devices and its control method - Google Patents
EMD Continuous leaching process chemical combination slot pH value control devices and its control method Download PDFInfo
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- CN106480471B CN106480471B CN201610972883.1A CN201610972883A CN106480471B CN 106480471 B CN106480471 B CN 106480471B CN 201610972883 A CN201610972883 A CN 201610972883A CN 106480471 B CN106480471 B CN 106480471B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/21—Manganese oxides
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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Abstract
EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control method, are related to field of industrial automation control.Control device includes PLC control system, operation panel, four online pH instrument, three solenoid valves, a sampling pump, three regulating valves.By operation panel input chemical combination slot pH control settings, sample interval and control parameter, the CPU module of PLC control system obtains the current real-time pH value of chemical combination slot by Analog input mModule, controlling value is calculated by PID again, controlling value is transferred to regulating valve by analog output module, make regulating valve according to controlling value controlling opening of valve, pulp discharge quantity is controlled, realizes the stability contorting of chemical combination slot pH value.On-line pH value automatic collection, actual pH deviation compensations, pH desired value amendments, production process automatic adjustment pH value to optimized scope can be realized using the present invention.
Description
Technical field
The present invention relates to field of industrial automation control, more particularly to a kind of EMD Continuous leaching process chemical combination slot pH value control
Device processed and its control method.
Background technology
In Continuous leaching process, generally six chemical combination slots in workshop section are leached, are connected two-by-two with overflow pipe between chemical combination slot,
First is flowed back with the last one chemical combination slot by pumping.The pH controls of each reactive tank are the emphasis of entire production control
And difficult point, continuously leach EMD（EMD is the abbreviation of electrolytic manganese dioxide）During the chemical combination of production, by chemistry in slot in technique
The situation of reaction divides three phases the pH controls of leaching workshop section, and the pH controls in each stage must assure that the model in setting
In enclosing, and reduce the fluctuation of pH value in each slot to the greatest extent.Each chemical combination slot is divided by the stage of reaction, the chemical combination slot pH of different phase
Value has different technological parameter indexs, and pH value control degree of stability is to influence the weight of final EMD product qualities and production cost
Want one of factor.
Current country EMD productions also substantially using manual sampling, then compare the measurement of chemical combination slot pH value according to test paper
The result that draws adjusts discharge quantity.This method has the following problems：1st, pH value detection and regulation and control existence time interval, it is stagnant
Property is big afterwards, and control is unstable, can cause situation about adjusting back repeatedly；2nd, manual sampling is susceptible to mistake；3rd, EMD compounding stages show
Field bad environments, frequently sampling can be to influencing worker's health；4th, it is not easy to form creation data report, production process is not easy
Management, causes end product quality unstable.The country also has some EMD manufacturing enterprises using online pH instrument come to chemical combination work
PH value progress acquisition monitoring in real time in journey, but control still by the way of manual adjustment, product quality is affected by human factors
Greatly, it is unstable.
The content of the invention
In order to solve the problems in the prior art, the purpose of the present invention is to provide a kind of EMD Continuous leaching process chemical combination slot pH
It is worth control device and its control method, can realizes on-line pH value automatic collection, actual pH deviation compensations, pH desired value amendments,
Production process automatically adjusts pH value to optimized scope.
The present invention to achieve the above object the technical solution adopted is that：A kind of EMD Continuous leaching process chemical combination slot pH value control
Device processed, including PLC control system, operation panel, which is characterized in that PLC control system include CPU module and respectively with CPU
Module connection DC24V DC power suppliers, ethernet communication module, Analog input mModule I, Analog input mModule II,
Analog output module, digital quantity input module, digital output module, ethernet communication module are connected with operation panel, control
Device processed further includes four online pH instrument, three solenoid valves, a sampling pump, three regulating valves, wherein an online pH instrument is set
It puts in the overflow pipe between 1, No. 2 chemical combination slot, an online pH instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and one
The online pH instrument of platform is arranged in the overflow pipe between 5, No. 6 chemical combination slots, the input terminals of three solenoid valves respectively with 1,3, No. 5 chemical combination
Slot connects, and the output terminal of three solenoid valves is connected respectively with sampling pump, also has an online pH instrument to be connected to sampling pump rear end
In pipeline, four online pH instrument are also connected with the Analog input mModule of PLC control system I respectively, three solenoid valves and sampling
Pump is also connected with the digital quantity input module of PLC control system, digital output module respectively, and three regulating valves are connected to
With the blanking pulp pot bottom of 1,3, No. 5 chemical combination slot, three regulating valves also Analog input mModule with PLC control system respectively
II connects with analog output module.
The further year technical solution that the present invention uses is：The Analog input mModule I, Analog input mModule II divide
It is not 12,8 tunnel 4-20mA Analog input mModules, analog output module is 12,8 tunnel 4-20mA analog output modules,
Digital quantity input module is 16 railway digital amount input modules, and digital output module is 16 railway digital amount output modules.
Another technical solution for using to achieve the above object of the present invention is：A kind of EMD Continuous leaching process chemical combination slot pH
It is worth control method, which is characterized in that the control method is come to each chemical combination slot using the control device described in the claims 1
PH value monitoring in real time and control, comprise the following steps：
（1）The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while are set by operation panel
The deviation range of interval time, sampling pH value and on-line pH value that sampling pump rotation samples between three different chemical combination slots；
（2）Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, acquisition sampling pump rear end
The sampling pH value of online pH instrument in pipeline, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state；
（3）The data of acquisition are by Analog input mModule I, Analog input mModule II, digital quantity input module conversion
Into digital signal, CPU module is transferred to by the core bus of PLC control system, is calculated by information processing, and by PID
Draw control output valve；
（4）By step（3）In obtained control output valve regulating valve, regulating valve root are sent to by analog output module
Change the control of aperture realization pulp tank discharge quantity according to control output valve；
（5）PLC control system is communicated by ethernet communication module and operation panel, shows that pH is controlled on operation panel
Value, sampling pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.
EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control method have the advantages that：
1st, pH control stabilities are improved：After EMD Continuous leaching process chemical combination slot pH value control device of the present invention, eachization
It closes slot pH value feedback and is no more than ± 0.3 with technological requirement pH value deviation, be configured with pH rotation sampling equipments（Sampling pump）, timing
Interval is sampled to be compared with on-line pH value, can effectively prevent online pH instrument due to pulp reaction solution blocks pH electrodes
Measure wrong data；
2nd, control method achievees the effect that high-precision control using PID control stage by stage：
pH:Hydrogen ionexponent refers to the ratio of the amount of hydrionic sum and total material in solution, pH=- lg（H+）I.e.
The negative value of the common logarithm of contained hydrogen ion concentration, so when pH is in the control range in 0-3 in EMD production technologies,
The fluctuation of system front end input will not generate larger effect to controlled pH, and PID control response speed need not be too fast at this time, P systems
Number needs to turn down, and prevents overshoot；And when pH is in the control range in 4-6, the fluctuation of system front end input can be to controlled
PH generates larger effect, and PID control needs quick response at this time, and P coefficients need appropriate amplification；
3rd, the degree of automation and reliability are high, easy to operate：Use the EMD Continuous leaching process chemical combination slot pH value of the present invention
During control device, each process data need to only be set in operation panel, control process is full automatic, and reliability is high, no
It needs, using other equipment, to operate very convenient；
4th, man-machine interface is friendly：Man-machine interface, which is provided, to be supported to control to adjust window, warning window and report on Process flow diaphragm
Table window etc., details show all information of the observable based on certain operation circuit, and detail display panel is included each
A circuit is for information about, detailed enough, so that operations staff can correctly be operated accordingly；For regulating loop, display
Go out the adjustings such as setting value, process variable, output valve, the method for operation, high/low limit value, alarm condition, unit, circuit configuration data
Parameter；For the circuit of digital output modul, then circuit configuration data and equipment state are shown；The instrumented data of PLC acquisitions is deposited
It puts into industrial database, can check that historical data only need to be by calling in man-machine interface by being set for preserving for a long time
Trend or report controls；
5th, control method uses current engineering widely used fuzzy-adaptation PID control in practice, and apparatus structure is simple, parameter
Adjust that stability is good, reliable operation, easy to adjust, method simply uses.
With reference to the accompanying drawings and examples to EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control
Method is further described.
Description of the drawings
Fig. 1 is EMD Continuous leaching process chemical combination slot pH value control device block diagram of the present invention；
The control principle block diagram of Fig. 2 EMD Continuous leaching process chemical combination slot pH value control methods of the present invention；
The rate-determining steps block diagram of Fig. 3 EMD Continuous leaching process chemical combination slot pH value control methods of the present invention.
Specific embodiment
As shown in Figure 1, EMD Continuous leaching process chemical combination slot pH value control device of the present invention, including PLC control system, behaviour
Make panel, PLC control system includes CPU module and the DC24V DC power suppliers being connected respectively with CPU module, ether Netcom
Interrogate module, Analog input mModule I, Analog input mModule II, analog output module, digital quantity input module, digital quantity
Output module.Ethernet communication module is connected with operation panel, control device further include four online pH instrument, three solenoid valves,
One sampling pump, three regulating valves, wherein an online pH instrument is arranged in the overflow pipe between 1, No. 2 chemical combination slot, one
Line pH instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and an online pH instrument is arranged on the overflow between 5, No. 6 chemical combination slots
Guan Zhong, the input terminal of three solenoid valves are connected respectively with 1,3, No. 5 chemical combination slot, the output terminals of three solenoid valves respectively with sampling pump
Connection also has an online pH instrument to be connected in the pipeline of sampling pump rear end.Four online pH instrument also respectively with PLC control system
Analog input mModule I connect, three solenoid valves and sampling pump also respectively with the digital quantity input module of PLC control system,
Digital output module connects.Three regulating valves are connected to the blanking pulp pot bottom with 1,3, No. 5 chemical combination slot, three tune
Section valve is also connected with the Analog input mModule of PLC control system II and analog output module respectively.
In the present embodiment, the Analog input mModule I, Analog input mModule II are 12,8 tunnel 4-20mA respectively
Analog input mModule, analog output module are 12,8 tunnel 4-20mA analog output modules, and digital quantity input module is 16
Railway digital amount input module, digital output module are 16 railway digital amount output modules.CPU module passes through PLC backboards and 8 tunnels 12
Position 4-20mA Analog input mModules, 12,8 tunnel 4-20mA analog output modules, 16 railway digital amount input modules, 16 ways
Word amount output module carries out data exchange.Online pH instrument exports 2 road 4-20mA signals by its internal transmitter（PH and temperature
Signal）To 12,8 tunnel 4-20mA Analog input mModules.The digital output modul signal of solenoid valve and sampling pump is sampled to 16 ways
Word amount inputs/goes out module.
3 regulating valves correspond to control No. 1, No. 3, No. 5 chemical combination slot discharge quantities（No. 2, No. 4, No. 6 are producing under normal circumstances
Blanking, forward chemical combination slot overflow is not required）, mounted on pulp pot bottom.Aperture is controlled by 12,8 tunnel 4-20mA analog outputs
Module gives, and real-time open degree feedback value is sent into 12,8 tunnel 4-20mA Analog input mModules.
Online pH instrument selects plum Teller support benefit brands, can be applicable in 0-140 DEG C of working environment, and with automatic water gas washing
Cleaning device is rushed, reaction solution is prevented to be attached to electrode surface, influences measurement accuracy.Closing is installed at overflow pipe in chemical combination slot
Under the baffle do not closed, slot bottom reaction solution could enter overflow.Chemical combination slot bottom installation sampling solenoid valve and sampling pump, sampling pump
1 online pH instrument is installed on reflux line.Online pH instrument pick-up exports 4-20mA signals by shielded cable again through signal isolation
It send to 12,8 tunnel 4-20mA Analog input mModules, carrying out A/D in inside modules is converted into ± 0 ~ 32768 digital signals, then root
Actual measured value is converted into according to instrument measurement range.
Control valve opening signal is given by PLC control system, and 0-100% apertures Setting signal is through CPU programs conversion ± 0-
32768 digital signals are transferred to 12,8 tunnel, 4 ~ 20mA analog output modules by backboard, then carry out D/A and be converted into 4-20mA
Signal output is to control valve opening receiving terminal.
Ethernet communication module is communicated from Ethernet and operation panel, by No. 1, No. 3, No. 5 chemical combination slot pH value ＆ temperature, adjust
Section valve opening, sampling solenoid valve, sampling pump working condition are sent by ICP/IP protocol to operation panel.It can be right in operation panel
The parameters such as pH value ＆ temperature, target pH controlling values, pH compensation ranges, sample interval are configured, and setting value will pass through TCP/
IP agreement is sent to CPU module.
The PLC that the present invention uses is the S7-300 series of PLC of west gate sub-brand name：DC24V DC power suppliers select model
For PS307；CPU module selects model CPU315-2DP；Ethernet communication module selects model CP343-1 Lean；Simulation
It measures input module and selects model SM331；Analog output module selects model SM331；Digital quantity input module selection type
Number be SM321；Digital output module selects model SM321；Then PLC backboards are all inserted into, PLC backboards select model
DIN guide rails；And PLC is installed and is fixed, mix various installations and connection attachment；Then the alternating current of AC220V is supplied to power module
Do power supply.
Liquid crystal touch screen or PC computers quantity 1 can be selected in operation panel, passes through ethernet netting twine and the Ethernet of PLC
Communication module connects.
A kind of conversion as the embodiment of the present invention：The PLC brands can be arbitrary brand, i.e., each module model is not
With the model of the module of brand corresponding function；Online pH instrument brand can be arbitrary brand；But must possess normal at 0-140 DEG C
Ability to work, and it is equipped with automatic flushing device.
EMD Continuous leaching process chemical combination slot pH value control method of the present invention please also refer to Fig. 2, shown in 3, the controlling party
Method, to the monitoring in real time of each chemical combination slot pH value and control, is comprised the following steps using above-mentioned control device：
（1）The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while are set by operation panel
The deviation range of interval time, sampling pH value and on-line pH value that sampling pump rotation samples between three different chemical combination slots；
（2）Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, acquisition sampling pump rear end
The sampling pH value of online pH instrument in pipeline, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state are relatively more online
PH value and sampling pH value, when deviation is less than setting deviation, then according to compensating approach in pH deviation ranges（Compensating approach method is
Common method is not describing in detail herein）, if more than setting deviation alarm, and current regulating valve is kept to export aperture, at this time may be used
Sampling pH value is selected to substitute current slot real-time pH value and carries out PID adjustings；
（3）The data of acquisition are by Analog input mModule I, Analog input mModule II, digital quantity input module conversion
Into digital signal, CPU module is transferred to by the core bus of PLC control system, according to current pH value and given pH value, CPU
Module passes through information processing, and passes through PID and control output valve is calculated, and PID is calculated as known technology and is not chatting in detail herein
It states；
（4）By step（3）In obtained control output valve regulating valve, regulating valve root are sent to by analog output module
Change the control of aperture realization pulp tank discharge quantity according to control output valve；
（5）PLC control system is communicated by ethernet communication module and operation panel, shows that pH is controlled on operation panel
Value, sampling pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.
Claims (3)
1. a kind of EMD Continuous leaching process chemical combination slot pH value control device, including PLC control system, operation panel, feature exists
In PLC control system includes CPU module and the DC24V DC power suppliers, the ethernet communication mould that are connected respectively with CPU module
Block, Analog input mModule I, Analog input mModule II, analog output module, digital quantity input module, digital output
Module, ethernet communication module are connected with operation panel, control device further include four online pH instrument, three solenoid valves, one
Sampling pump, three regulating valves, wherein an online pH instrument is arranged in the overflow pipe between 1, No. 2 chemical combination slot, an online pH
Instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and an online pH instrument is arranged on the overflow pipe between 5, No. 6 chemical combination slots
In, the input terminal of three solenoid valves is connected respectively with 1,3, No. 5 chemical combination slot, and the output terminal of three solenoid valves connects respectively with sampling pump
Connect, also have an online pH instrument be connected in the pipeline of sampling pump rear end, four online pH instrument also respectively with PLC control system
Analog input mModule I connects, three solenoid valves and sampling pump also respectively with the digital quantity input module of PLC control system, number
Word amount output module connects, and three regulating valves are connected to the blanking pulp pot bottom with 1,3, No. 5 chemical combination slot, three adjustings
Valve is also connected with the Analog input mModule of PLC control system II and analog output module respectively.
2. EMD Continuous leaching process chemical combination slot pH value control device as described in claim 1, which is characterized in that the simulation
Amount input module I, Analog input mModule II are 12,8 tunnel 4-20mA Analog input mModules respectively, analog output module
It is 12,8 tunnel 4-20mA analog output modules, digital quantity input module is 16 railway digital amount input modules, digital output mould
Block is 16 railway digital amount output modules.
3. a kind of EMD Continuous leaching process chemical combination slot pH value control method, which is characterized in that the control method is to utilize above-mentioned power
Profit requires the control device described in 1 to the monitoring in real time of each chemical combination slot pH value and control, to comprise the following steps：
（1）The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while is set and sampled by operation panel
Pump impeller changes the deviation range of the interval time sampled between three different chemical combination slots, sampling pH value and on-line pH value；
（2）Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, the pipeline of acquisition sampling pump rear end
In online pH instrument sampling pH value, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state；
（3）The data of acquisition are converted into counting by Analog input mModule I, Analog input mModule II, digital quantity input module
Word signal is transferred to CPU module by the core bus of PLC control system, by information processing, and passes through PID and is calculated
Control output valve；
（4）By step（3）In obtained control output valve regulating valve is sent to by analog output module, regulating valve is according to control
Output valve processed changes the control that aperture realizes pulp tank discharge quantity；
（5）PLC control system is communicated by ethernet communication module and operation panel, shown on operation panel pH controlling values,
Sample pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.
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| CN111304438B (en) * | 2020-03-30 | 2023-06-30 | 中国恩菲工程技术有限公司 | Multistage leaching system and control method thereof |
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